Shock absorber



' c. D. JOHNSTON June 11, 1940.

SHOCK ABSORBER Filed Aug. '1, 1958 Patented June 1 1', 1940 Q I I t UNI-TED STATES PATENT oli-" cl-z rater-2:25:21 m

This inventi n relates to cushioning devices receive the cushioning member, and are also for automobiles, trucks; trailers and other vehipreferably provided with ri 1' 1 nihl P 1 cles for relieving the objectionable road shocks' poses.

. which usually occur while travelling over rough Attached to and forming a continuation of the or uneven surfaces, and theobject of my invenlower end of the rod ii is a spring it, the other tion is to devise a construction employing an air end of which spring is secured to orbears against cushion to take themajor part of the shock. the bottom 'of the sleeve l3. This springis nor- I attain my object by means of the construcmally in a state of partial compression. Similartions hereinafter described and illustrated in the ill a spring has one end secured to and forms accompanying drawing in which i a continuation of the rod It, the other end of 19 Fig. 1 is a side elevation of amotor car showhis spring being secured or anchored to the boting the improved shock absorbers applied tom oi the sleeve M. This spring 20 is normally thereto; in a state of partial tension.

I Fig. 2 is a vertical section of the absorber; and A guide pin 2! is provided for each of" the Fig.3 a section on the line 3-3 mm. a. springs is and 20 to hold thesame inmate.

In the drawing like numerals of reference in- -.which pins re 1' len h o ml P r ly in dicate corresponding parts in the different i'lg-' the tubular rods II and I6.

ures Theoperation of the shockabsorber is as fol- 'R eferring to Figll, i indicates a front axle and ,I W In going over a ump, he n n y is for $0 2 the rear axle on which the motor car body 3 is the axle and chassis frame to move closer to- 20 supported 'by springs 4 and 5 in the ordinary seth r- 'I'hiscau es a further compression ofthe manner. Four shock absorbers will preferably sprin l9. W le he t n n on h 11171118 20 i be employed,'two for the front axle, one of which uc A the m i pre sure is exerted will be positioned at each side oi the body, and ag in he s na y pneumatic cushioning two for the rear axle, one of which will also be member by. thehead i'l, the pressure being re- 85 positioned at each side of the body. lieved 011 e pp e S d y the reduction of The invention, however, is concerned with the tension on h S g 20. .Ul e ebound particular. construction of the shock absorbers, De .i 8 ov the axle 8nd 61188818. which will now be d rib d, the tensioning on the spring 20 is increased On the chassis'6 of the vehicle is mounted a while the compression ofthe sp ng II is de- 80 laterally directed iri lwhich pin may be secured creased, and si ar y while t e oi the directly to the chassis as indicated at the rear of head ll onthe pn um member increases. the the motor car'in Figure 1, orto a special bracket p essu o the e decreases; I as indicated at the front of the vehicle in Fig.. It Wi ln h e prings i0 and. "tend 1, to provide sumcient room .for the installation oke l the axle and e s Spaced an lntermedi- 8i and operation of the shock absorber. Onthis ate dis ance d o-t any s i on pin I is mounted a rim 8 adapted to receive an the one is counteracted bya corresponding strain annular pneumatic cushioning member, the on the other, a d. Similarly ny P essure on latter being preferably provided with an outer either the lower or upperiside 0f he-pneumatic 40 casing 9 demountably supported on the rim-and cushioning member will be relieved at the opan inner inflatable tube ill, the arrangement posi e side- In the event that the shock is of being'very similar to that of a pneumatic tire such a nature as to compress the springs to their 'asused on the ground wheels of an automobile. limit, any additional movement will be applied The ln er tube is providedwith: a valve Ii by ag ins the p ic-cushioning m h means of which it may be inflated ordeflated as v desired. g siliency of the pneumatic cushioning member Ontheaxle is mounted-a member i2, on which may be readilyxcontrolled by the air pressure is formed; a pair of guide sleeves "and It into within it. It will also be seen that theshock which project tubularrods II and l6. The rod i5 absorber comprises few moving parts and there i is provided wi en pedhead H in which is little danger of it getting. out of'order. It 'is Q0 the under side of the. cushioning member is also comparatively easy to install. While the i is P ded with an are-- What I claim as my invention is:

t shaped head-J8 which is adapted tc,. ho'o'k over L-For use with a vehicle having ant-axl a d the upper side f him lh rh a body resiliently mounted on the axle, a shock oo heads and II are concaved in cross section to absorber comprising a support adapted to be ll It will be-apparent, of course, thatthe re- 45 mounted on to the 'body; a support adapted to bev mounted on the axle, one of said supports having pneumatic cushioning means mounted there: on; a pair of compressor members, a spring connecting each of said compressor members to said support, one of said springs being under tenbody resiliently mounted on the axle, a shock absorber comprising a support adapted to .be mounted on to the body; a support adapted to be mounted on the axle, one of said supports having pneumatic cushioning means mounted thereon; a pair of compressor members; a spring connecting each of said compressor members to said support, one of said springs being undertension and the other under compression, the compressor I members to ,which the compression spring is connected engaging the adjacent side of the cushioning means to resist movement or the supports towards one another, and the compressor mem ber to which-the tension spring is connected engaging the remote side or the cushioning means to resistmovement 01. said supports away from one another, said other supp f having guide sleeves thereon to receive the springs and-adjacent ends of the compressor members.

3. For use with a vehicle having an axle and a body resiliently mounted on the axle, a shock absorber comprising asupport adapted to be mounted onto the body; a support'ad'apted to be mounted on the axle, one of said supports ioning means to, resist movement or the supports towards one another, and the compressor member to which the tension spring is connected engaging the remote side of the cushioning means to resist movement oi said supports away from one another, said-other support having guide pins thereon projecting into the tubular stems.

4. For use with a vehicle having an axle and a body resiliently mounted on the axle, a shock absorber comprising a support adapted to be mounted on to the body; a support adapted to be mounted on the axle, one of said supports having pneumatic cushioning means mounted thereon; a pair of compressor members, each having a tubular stem; a spring connecting the tubular stems of each compressor member to said support, one of said springs being under tension and the other under compression, the compressor members to which the compression spring is coni nected engaging the adjacent side of the cushioning means to resist movement of the supports towards one another, and the compressor member to which the tension spring is connected engaging the remoteside of the cushioning means to resist movement of said supports away from one another. said other support having guide pins r CURTIS-DANIEL Jorms'rom 

